Nemo iudex in causa sua
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Nemo iudex in causa sua (or nemo iudex in sua causa) is a Latin phrase that means, literally, no-one should be a judge in their own cause. It is a principle of natural justice that no person can judge a case in which they have an interest. The rule is very strictly applied to any appearance of a possible bias, even if there is actually none: "Justice must not only be done, but must be seen to be done".
May also be called:
- nemo iudex idoneus in propria causa est
- nemo iudex in parte sua
- nemo debet esse iudex in propria causa
- in propria causa nemo iudex
The legal effect of a breach of natural justice is normally to stop the proceedings and render any judgment invalid; it should be quashed or appealed, but may be remitted for a valid re-hearing.
- R v Sussex Justices, ex parte McCarthy,  1 KB 256,  All ER 233
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